Investigators say Keyes got thrill from killing people

Investigators believe Israel Keyes worked alone and no one, not even his girlfriend, knew what the Alaskan contractor was doing in his criminal cross country travels.

He was finally caught after robbing a bank in Texas and brought to Alaska to face murder charges

While he was there he spent dozens and dozens of hours detailing his crimes telling investigators his story his way.

“There is no one who knows me or has ever known me who knows anything about me, really,” Keyes said in an audio recording during an interview with investigators.

Keyes goes on to say, “They're going to tell you something that doesn't line up with what I tell because I'm two different people basically. And the only person who knows about the kind of things I'm telling you is me."

FBI investigators interviewed Keyes while he was awaiting trial in Alaska in the slaying of 18-year-old barista Samantha Koenig.

Koenig's body was discovered beneath a sheet of ice on a frozen lake.

“We tried to ask him his different motivations and maybe Israel Keyes will be the only one who ever knows that, but at one point, he did respond to us on it wasn't why, but why not,” Chief Criminal Investigator Kevin Feldis said.

As soon as he was in custody in Alaska, Keyes confessed almost immediately to the Koenig killing.

And when he did, investigators knew she wasn't the first person Keyes killed.

“He showed no remorse for what he had done. There appeared to be adrenaline to be in his body when he was telling us what he had done, but it wasn't a sense of remorse,” Feldis explained.

A week later, they went back to Keyes to press him for information on other murders.

That's when he identified Bill and Lorraine Currier by name and confessed to killing them.

"We confronted him about the fact that we thought he had committed other crimes and other murders and talked to him about how he might want to be in control of how the story was ultimately told,” Feldis said.

He detailed how he meticulously picked their house based on its easy-to-read layout and using Google maps to show investigators where he took the Essex couple to kill them, an abandoned farmhouse on Main Street in Essex.

“Obviously we could never comprehend the heinous acts committed by Israel Keyes, but for him it appeared he got some sort of a thrill out of what he did,” Feldis said.

Keyes grew up in Washington state and told investigators he had a relatively happy childhood with several brothers and sisters.

He joined the military, but never was in combat.

When he got out, investigators believe he may have lived for several months on his property in constable, N.Y. before moving to Alaska.

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